Machine for bending rods.



J. KARPOUICH.

MACHINE FOR BENDING RODS.

APPLICATION FILED MAR.29. I916.

Patented Feb. 6, 1917.

2 SHEETS-SHEET I- Fig. '1.

nven On 6 I John Kflrlouklh by MMaM ATTys J. KARPOUICH.

MACHINE FORBENDING RODS.

APPLICATION FILED MAR-29, 1915.

1,214,551 I Patented Feb. 6, 1917.

2 SHEET$-SHEET 2.

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JOHN KARPOUICI-I, OF BOSTON, MASSACHUSETTS.

MACHINE FOR BENDING RODS.

Specification of Letters Patent.

Patented Feb. 6, 191%.

Application filed March 29, 1916. Serial NO. 87,591.

To all whom it may concern:

Be it known that 1, JOHN KARroUIoH, a subject of the Czar of Russia, residing'at Boston, county of Suifolk, State of Massachusetts, have invented an Improvement in Machines for Bending Rods, Tubes, Bars, &c., of .which the following descrlption, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to a machine for bending rods, tubes, bars, etc, and has for its object to provide a novel device by which the rod or tube can be bent. to any desired degree.

The device comprises a bending element having a die or forming portion about which the rod or tube is bent, and means for'securing one end of the "rod-or tube to said bending element and for rotating said bending element thereby to bend the rod or tube about the die portion thereof.

The device also comprises means connecting the bending element from its rotating means at a predetermined point in its rotation, depending on the extent of the bend to be given to the rod or tube. This disconnecting means is capable of adjustment so that it can be set to automatically disconnect the bending element from its driving mechanism at any desired point in the rotative movement of the bending element, thus providing for bending the rod or tube to any desired extent.

In order to give an understanding of my invention, I have illustrated in the drawings a selected embodiment thereof which will now be described, after which the novel features will be pointed out in the appended claims.

Figure 1 is a side view of a machine embodying my invention showing a part.thereof in section; Fig. 2 is ,a'section on the line 22, Fig. 1; Fig. 3 is an end view of Fig. 1 lmiking toward the left; Fig. 4 is a section on the line M, Fig. 1; Fig. 5 is a section on the line 5 5, Fig. 2; Fig. (i is a perspective view of the bending element removed; Fig. 7 is a fragmentary section on 50 the line 77, Fig. 5; FigsuS, 9 and 10 show elevations and cross-sectional views of different forms which may be bent by means of my improved machine.

The bending element is indicated at l and it is rotatably mounted upon a suitable support and is formed with a die portion 2 for disengine lathe.

about which therod, tube or bar is bent. It is also provided with a projection 3 extending parallel to the die portion 2 and between which and said die portion one end 4: of the rod, tube or bar to be bent is inserted, as seen in Fig. 3.

The bending operation is accomplished by rotating the bending element 1 in the direction of the arrow, Fig. 3, after the rod has been placed in the position shown in said figure, this rotary movement operating to bend the rod around the die portion. The shape which will be given to the rod as it is bent depends upon the shapeof the die portion In the construction shown, this die portion is cylindrical in shape and thus the rod or tube will be bent into a circular or partially circular shape, depending .upon the ektent to which the. bending member is rotated.

The bending member is herein shown as rotatably mounted upon a. driving shaft 6 which may be supported in any suitable way and driven from any suitable source of power. In the construction shown, this shaft is rotatably mounted or journaled in a bearing 7 which is adapted to be secured to the tool carriage 8 of an engine lathe-10 and the driving shaft 6 is constructed to be secured to and driven from the live spindle of the This, however, is only one of inany ways in which the shaft 6 can be supported and driven and, therefore, I do not wish to be limited to any particular way of supporting or driving the shaft. The end of the shaft 6 is herein shown as clamped in a chuck 9 which is driven by the usiial gearing 11 of the engine lathe.

My improved bending device is so constructed that the bending member 1 is normally disconnected from the shaft so that the shaft may rotate without driving the bending member. The bending member. however, can be readily'connected to the shaft so as to rotate therewith. Means are also provided for automatically disconnect ing the bending member from the shaft when said bending member has rotated through a predetermined angle dependent on the amount of bend which it is desired to give two portions and 16 of different diameters to fit the two diameters of the shaft 6, and, said member is also provided with an interior shoulder 14 adapted to engage the shoulder 10 of the shaft. This bending member 1 is capable of movement longitupassed off from the cam, the end of the dinally of the shaft, its movement toward the left being limited by engagementof the shoulder 1% with the shoulder 13, and HS movement to the right being limited by the head 17 of a screw 18 which is screwed into the shaft. The bending element is also provided with a notch or recess 19 which is adapted to receive the end. 20 of a clutch element 21 in the form of abar slidably mounted in a groove 22 formed in and extending longitudinally of the shaft 6. This clutch element 21 is acted upon by a spring- 23 whichftends to force it to the right, Figs. 1 and 5, and it is provided at its end with a head 24;. The length of the clutch element 21 is such that when the head 2-1 rests against the plate or disk at the end of the bearing member 7, the end 20 of said clutch element will project slightly beyond the face 26 of the bearin'g'member,but not sufficiently be yond said face to' enter the notch 19 when the bending member 1 at the limit of its movement to the right, as shown in dotted lines Fig. 1. Therefore,- when thebending member is moved tothe right as far as the head 17 of the screw 18 will permit, said member will be loosely retained on the shaft 3 and the shaft 6 can be rotated withou-tgiving rotation to the bending member.

To couple or clutch the bending element to the shaft, said bending element is moved to the left from the dotted line position Fig. 1, to the full line position, Figs. 1 and 5, such movement bringing the face 26-aga-inst the end 20 of the clutch element 21 and forcing said clutch element backwardly slightly against the action of the spring 23. If the shaft 6 is then rotated, the rotation thereof will bring the end 20 of the clutch member 21 into alinement with the notch19, and when this position is reached, the spring 23 will force the clutch member into the notch, thus couplingthe bending member to the shaft, and thereafter the bending member will rotate with the shaft.

- My invention includes also means for automaticaally disconnecting the clutch element from the bending member at any desired predetermined point in the rotation of the shaft, depending on the extent to which the rod or tube 5 is to be bent. For this purpose, I provide a cam member 27 which is supported by the bearing 7 and is situated to engage the head 24 as the shaft rotates. The cam member 27 is of such a shape and size that as the head 24: passes thereo-ver, the clutch member 21 will be moved to the left, Figs. 1 and 5, a sufiicient distance to completely withdraw the end 20 clutch element will be carried beyond the notch 19. When the head 24 finally passes off from the cam 27) the spring .23 tends to a move the clutch element 21. to the right and the engagement of the end 20 thereof against the face 26 of the bending member will force the bending member to the right into the dotted line position Fig. 1, in which P05] tion it is entirely free from the clutch meniber. The extent of the bend which is given to the rod or bar 5 depends upon the posi tion of the cam 27, and I have herein provided means for adjusting the angular posi; tion of the cam so that the bending member 1 may be. disconnected fromthe shaft afte the latter has rotated through any predetermined angle. This provides means whereby the machine may be adjusted to bend the rod 5 to form a half circle, quarter circle, complete circle, or any other desired portion of a circle.

While various constructions may be employed for adjustably supporting the cam 27, the construction herein shown is a practical one. 25 which encircles the shaft 6 and is capable of rotative movement thereabout, thereby to adjust the cam into its desired angular position. This disk 25 is shown as secured to a. worm-gear 30 which also encircles the shaft 6 and which meshes with a worm 31 on'ashaft 32 that is journaled in suitable bearings 33 carried by the bearing 7 and is provided with a Hand wheel 34 by which it may be turned. 'The worm gear 30 is inclosed in a. casing 35 which is secured to the bearing 7 ,and this casing is formed with a flange 36 which fits in a groove37 formed in the disk 25, therebyservin'g-to hold thedisk and gear in their proper relative position. By this means the. disk 25 with its cam 27 can be turned into any angular 'position thereby to place the cam in the proper location to, produce. the desired bend in the rod 5. The flange 36 of the casing is shown as having an indication mark 38 thereon and the disk 25 is provided with graduation marks 39 whichcooperate with the indication mark 38 to assist in setting the disk properly.

The bearing 7 is provided with a rest portion 40 on which the rod or bar 5 rests as it is being bent.

The operation of the device will be readilv understood from the above description, but may be briefly summarized as follows: The bending element 1 is moved into its extreme position to the right in which it is This cam is mounted on a disk.

disconnected from the driving shaft and is turned into the position shown in Fig. 3

with therodgripping pin 3 on 'the under side. A rodis thenplaced on the rest 40, 5 and the end of the rod is inserted between the die portion2 and gripping pin. 3, as shown in Fig. 3. The shaft 6 is then set in operation and ,the bending member is .mov ed to the left. When during the, ro-

tation of the shaft, the clutch member 20 comes into alinement with the notch 19 of the bending member, said clutch will .enter the notch 19, thus coupling the bending member to the shaft, and the bending member will then rotate in the direction of the arrow, Fig. 3. As it rotates, the rod 5 is bent around the die portion2, this bending operation continuing until the clutch member 21 is Withdrawn from the notch 19'by the engagement of the head 24 with the cam 27. The bending member then comes to rest and as the head 24 passes off from the cam 27, the clutch member is moved to the right under the action of the spring, thus forcing the bending member to the right into the dotted line position, Fig. 1. The shaft may then continue its rotation without moving or rotating the bending element and the bent rod may then be removed and another one placed in position to be operated on.

I have herein provided means for locking the worm 31 from rotation during the bending of a rod or tube. This locking device comprises a spring-pressed locking pin 60 carried by the wheel 34 and adapted to engage any one of a plurality of notches 61 formed in the plate 62 fast to the bearing 7. The locking pin 60 can be readily withdrawn from the notch which it occupies thereby to permit the wheel 34 to be turned and the cam 27 to be adjusted, and when proper adjustment is made the wheel may be locked by inserting the locking pin 60 into one-of the notches 61.

Figs. 8, 9 and 10 show different shapes which may be readily bent. In Fig. 8 a round rod 5 is bent to form the semi-circular por-' tion 43. In Fig. 9 a round rod is bent to form the circular loop 44 at one end and the partially circular loop 4:55 at the other end, the loop 45 being larger than loop at. In order to make the larger loop 45, it will be necessary, of course, to use a bending element having a larger die portion 2 than that which to such a construction as the bearing 7 might be mounted on any suitable support and the shaft 6 may. be driven from any suitable source of power without departing from the invention.

I claim:

L'In a machine for bending rods, tubes and the like, the combination with a driving shaft, of a bearing member therefor, a bending member loosely mounted on said shaft at one side of the bearing member and adapted by its rotation to bend atube or rod, said bending member havi'nga notch, a, clutch member slidable longitudinally of the shaft and extending through the bearing mei-nber,

said clutch member being rotatable with the.

shaft and adapted in one position to engage said notch, thereby to couple the bending member to the shaft, and means on the op posite side of the bearing member from the bending member to engage said clutch member and move it longitudinally of the shaft thereby to disconnect it from the bending member when said bending member has rotated through a predetermined angle.

2. In a device of. the class described, the.

combination with a driving shaft, of a bearing member therefor, a bending member loosely mounted on said shaft and constructed by its rotation to form a bend in a tube or rod, said bending member having a notch, a clutch member slidable longitudinally of the shaft and extending through the bearing member, said clutch member being-rotatable with the shaft and adapted in one position to engage said notch thereby to couple the bending member to the shaft. and a stationary cam situated to engage the clutch member at a predetermined point in the rotation of the shaft thereby to move it longitudinally and disengage it from the bending member.

3. In a device of the class described, the combination with a bearing member, of a driving shaft journaled therein, a bending member loosely mounted on-the shaft at one side of the bearing member, a clutch member slidable longitudinally of the shaft and extending through said bearing, said clutch member in one position being operative to clutch the bending member to the shaft, a cam carried by the bearing member on the opposite side thereof from the bending member and adapted to engage the clutch member at a predetermined point in the rotation of the shaft and thereby to disengage said clutch member from the bending member.

4. In a device of the class described, the combination with a driving shaft, of a bending member loosely mounted thereon and caable of free sliding movement longitudinally thereof, a clutch member mounted for sliding movement longitudinally of the shaft and normally occupying a position to be en gaged by the bending member when the lat- &

ter is moved longitudinally of the shaft in one direction, and means for withdrawing the, clutch member from the bending member at a predetermined point in the rotation.

' 5. In a device of the class described, the combination with a driving shaft, of a. bending member loosely mounted thereon and capable of a limited free movement longitudinally thereof, a clutch member mounted for sliding movement longitudinally of the shaft and normally occupying a position to be engaged by the bending member when the latter is moved to its limit longitudinally of the shaft in one direction, and adjustable means for witlnlrawing the clutch member from the bending member at a predetermined point in the rotation.

6. In a device of the class described, the combination with. a driving shaft, of a bearing member in which. said shaft rot-ates, a bending member loosely mounted on the shaft and provided with a notch. said bending member presenting a die portion and rod-gripping means. a clutch member extending longitudinally of the shaft through the bearing membe and adapted in one position to engage the notch of the bending member thereby to clutch it to the shaft, and an adjustable cam carried by the bearing member and adapted to engage the clutch incur her to withdraw it from engagement with the bending member.

7. In a device of the class described, the combination with a driving shaft, of means to rotate it, a bending member loosely mounted on the shaft and capable of a limited free movement longitudinally thereof, said bending member being adapted by its rotation to bend a rod or tube, means to clutch the bending member to the shaft when said bending member is moved longitudinally thereof in one direction, and automatic means to unclutch said member from the shaft when the latter reaches a predetermined angular position.

8. In a device of the class described, the combination with a shaft, of means to retate it, a bending member loosely mounted thereon and capable of'movement longitudinally thereof, said bending member being provided with a die portion and rod-gripping means whereby a rod or tube may be bent about the die-portion by rotation of the bending member, means to clutch said bending member to the shaft when the latter is moved longitudinally thereof in one direction, and automatic means to unclutch said member from" the shaft when the shaft reaches apredetermined angular position.

9. In a device of the class described, the combination with a shaft, of means to rotate it, a bending member loosely mounted on the shaft and adapted by its rotation to bend a rod or tube, a clutch member slidably mounted on the shaft and by which the bending member is clutched thereto, and a cam for moving the clutch member longitudinally of the shaft, thereby to disconnect it from the bending member.

10. In a device of the class described, the combination with a shaft, of means to rotate it, a bending member loosely mounted on theshaft and adapted by its rotation to bend av rod or tube, a clutch member slidably mounted on the shaft and by which the bending member is clutched thereto, a cam for moving the clutch member longitudinally of the shaft thereby to disconnect it from the bending member, and means to adjust the position of the cam whereby the bending 80 member may be disconnected from the shaft when the latter is in any desired angular position.

11. In a device of the class described, the combination with a driving shaft, of means to rotate it. a bending member loosely mounted thereon and capable of movement longitudimilly thereof, said bending member having a die portion and rod-gripping means, a clutch member slidably mounted on the shaft and adapted. in one position thereof and of the bending member to clutch said bending member to the shaft, an adjustable dish encircling the shaft, and a cam carried by said disk and by which the clutch member is withdrawn from the bending men'iber.

- 12. In a device of the class described, the combination with a driving shaft, of a bending member loosely mounted thereon and capable of -a limited free sliding movement longitudinally thereof, a clutch member mounted for sliding movement longitudinally of-the shaft, automatically-operative means acting on the clutch member to cause -mounted for sliding movement longitudinally of the shaft, automaticallyoperative means acting on the clutch member to cause it to engage the bending member when the latter is moved to its limit longitudinally of the shaft in one direction, and adjustable means for withdrawing the clutch member from the bending member against the action of said automatically-operative means in a predetermined point in the rotation of the shaft.

14. "In a device ofthe class described, the con'ibination with a driving shaft, of a bending member loosely mounted thereon and capable of a limited free sliding movement longitudinally thereof, a clutch member.

mounted for sliding movement longitudinally of the shaft, automatically-operative means acting on the clutch member to cause itto engage the bending member When the latter is moved to its limit longitudinally of the shaft in one direction, and a station'- ary cam with Which the clutch member comes into engagement at a predetermined point in, the rotation of the shaft and by which the clutch member is disengaged from the bending member;

15. In a device of the class described, thecombination with a driving shaft-,- of a bending member loosely mounted thereon and cameans acting on the clutch, member to cause it to engage the bending member when the latter is moved to its limit longitudinally of the shaft in one direction, and an adjustable stationary cam with which the clutch member comes into engagement at a predetermined point, in the rotation of the shaft and by Which the clutch member is disengaged from the bending. member.

In testimony whereof, I have signed my name to this specification.

JOHN KARPOUICH."

Copies of this patent may be obtained for five cents each, by addressing the commissioner of intents,

Washington, D. G. 

